EVALUATION OF CAPACITY SPECTRUM METHOD FOR ESTIMATING THE PEAK INELASTIC RESPONSES

The accuracy of the capacity spectrum method (CSM) depends on the precise estimation of equivalent period and damping ratio as well as the modification of the demand spectrum. In this paper, the CSM provided in ATC-40 for estimating the peak inelastic responses is evaluated. First, the effect of equivalent period and damping ratio estimation on the accuracy of the CSM is assessed. Analyses results indicate that the difference between estimation methods is large when the structural nonlinearity is large, but becomes negligible as the hardening ratio increases. Next, the reduction factors provided in ATC-40 and Eurocode are evaluated. It is found that the acceleration responses obtained using the factor of Eurocode is closer to the actual ones than those obtained using the factors of ATC-40. Finally, the demand spectrum is constructed using the peak absolute acceleration and pseudo-acceleration. The results obtained using the peak absolute acceleration is found to be generally larger than those obtained using the pseudo-ones. Since the original CSM generally underestimates the response, the use of peak absolute acceleration in the construction of demand spectrum produces the response relatively closer to the exact one. However, the use of peak absolute acceleration overestimates the response more when the original CSM overestimates the response.     

深入学习十六届四中全会《决定》应该研究的几个问题

本认为,深入学习和把握《中共中央关于加强党的执政能力建设的决定》的精神实质,应进一步加强对有关问题的分析和研究：一是对《决定》的重大理论和实践意义要有充分地认识;二是对党的执政能力和执政能力建设理论的科学内涵要有一个全面、准确地把握;三是时《决定》将会带来一系列影响深远的重大变化和对我国未来走向的影响要加以关注和研究。《决定》以与时俱进、勇于创新的理论品格和诸多科学、富于新意的制度构想,引人关注,其贯彻和落实,必将给中国带来一系列影响深远的重大变化。     

充分发挥档案工作的服务职能

档案信息资源是国家和社会信息资源不可或缺的重要组成部分,档案工作承担着保存历史、传承文明、资政育人、服务社会的重要职能,档案工作者的良好素质是发挥档案服务职能的关键所在。为此,本文认为,只有坚持改革,不断创新,才能充分发挥档案工作的服务职能,使档案工作在现代化建设中发挥更大的作用。     

Gas breakthrough pressure for hydrocarbon reservoir seal rocks: implications for the security of long-term CO2 storage in the Weyburn field

This paper reports a laboratory study of the gas breakthrough pressure for different gas/liquid systems in the Mississippian‐age Midale Evaporite. This low‐permeability rock formation is the seal rock for the Weyburn Field in southeastern Saskatchewan, Canada, where CO₂ is being injected into an oil reservoir for enhanced recovery and CO₂ storage. A technique for experimentally determining CO₂ breakthrough pressure at reservoir conditions is presented. Breakthrough pressures for N₂, CO₂ and CH₄ were measured with the selected seal‐rock samples. The maximum breakthrough pressure is over 30 MPa for N₂ and approximately 21 MPa for CO₂. The experimental results demonstrate that the Weyburn Midale Evaporite seal rock is of high sealing quality. Therefore, the Weyburn reservoir and Midale Beds can be used as a CO₂ storage site after abandonment. The measured results also show that the breakthrough pressure of a seal rock for a gas is nearly proportional to the interfacial tension of the gas/brine system. The breakthrough pressure of a CO₂/brine system is significantly reduced compared with that of a CH₄/brine system because of the much lower interfacial tension of the former. This implies that a seal rock that seals the original gas in a gas reservoir or an oil reservoir with a gas cap may not be tight enough to seal the injected CO₂ if the pressure during or after CO₂ injection is the same or higher than the original reservoir pressure. Therefore, reevaluation of the breakthrough pressure of seal rocks for a given reservoir is necessary and of highest priority once it is chosen as a CO₂ storage site.     

A FIBRE FINITE BEAM ELEMENT WITH SECTION SHEAR MODELLING FOR SEISMIC ANALYSIS OF RC STRUCTURES

The paper describes the formulation of a non-linear, two-dimensional beam finite element with bending, shear and axial force interaction for the static and dynamic analysis of reinforced concrete structures. The hysteretic behaviour of “squat” reinforced concrete members, in which the interaction between shear and flexural deformation and capacity is relevant for the overall structural performance, is emphasised. The element is of the distributed inelasticity type; section axial-flexural and shear behaviours are integrated numerically along the element length using a new equilibrium-based approach. At section level a “hybrid” formulation is proposed: the axial-flexural behaviour is obtained using the classic fibre discretisation and the plane sections remaining plane hypothesis, the shear response instead is identified with a non-linear truss model and described with a hysteretic stress-strain relationship. The latter contains a damage parameter, dependent on flexural ductility, that provides interaction between the two deformation mechanisms. The element has been implemented into a general-purpose finite element code, and is particularly suitable for seismic time history analyses of frame structures. Analytical results obtained with the model are compared with recent experimental data.     

企业理论发展脉络与研究内容评析

作为经济社会发展到一定历史阶段的产物,企业处于不断的演变过程中,企业理论也同样处于不断发展与演化过程中。本文试图通过对企业理论的发展脉络进行回顾和梳理,从经济学和管理学两个方面整理出典型的企业理论,并作出简要的述评,以期厘清企业理论的发展脉络和逻辑演进路径,并对企业理论的研究内容作出评析。     

The Politics of Moral Patience

Abstract

Pluralistic societies perpetually seek for ways to get along, given the reality of that pluralism. That search generates pluralistic responses which include forbearance, concord, tolerance, radical democracy, among many others. This paper begins to explore the putatively rich notion of moral patience as a way of being in the world as Christians; moral patience as a way of living with the ‘‘other’’ without reducing the importance of the Christian faith and practice; moral patience as a way of setting the stage for living with long-term difference but without terminal division; moral patience not just as a way of taking a long time to make decisions, but as the finding of a way forward and getting on with life without first coming to some form of unified resolution. Specifically, my purpose is to argue that moral patience creates time and space for the Christian community to develop an ethic of discipleship; i.e. a politics that finds its source in the patience of God, in the imitation of Jesus Christ, and in the power of the Spirit. Such moral patience acts as a sort of political and ethical capacity, and encourages us to believe that because God has time, we also have time — to listen, to be vulnerable, to engage in important conflicts without becoming violent, to refuse to be driven by the speed that society seeks to impose on us, and to resist the notion that the world and other people are directly in our control — indeed to resist the notion that we are radically autonomous individual entities. The paper concludes with a brief glance at how the Christian practice of moral patience might shape work in a number of fields of moral inquiry.     

发挥地方党报优势 提升舆论引导能力

提高舆论引导能力,是地方党报肩负的使命,是改进党的思想理论宣传教育的重要内容。而要提高地方党报舆论引导能力,就要在充分发挥地方党报优势上做文章。本文从发挥政治资源优势,创新舆论引导手段、把握新闻规律三个方面对如何发挥地方党报优势,提升舆论引导能力进行了阐述。